I'm using the latest version of WP. I've been trying out various ways of protecting my weblog from comment spam, and decided to test the "must register before being able to comment" function. I filled out the registration form that appeared when I tried to comment with a blurb for a name and a real email address, and registered. The form reported that an email had been sent. No email arrived.
I don't think the email has been filtered out as spam.
I checked and my test person was in fact registered on my Dashboard.
Is there another way I can test this thing? Is there a likely reason it isn't working?